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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 305 |
| 5 | 6756 |
| 6 | 216552 |
| 7 | 9416240 |
| 8 | 530764089 |
| 9 | 37498693555 |
| 10 | 3235722405487 |
| 11 | 334075729235172 |
| 12 | 40587204883652869 |
| 13 | 5722676826879812177 |
| 14 | 925590727478445526747 |
| 15 | 170032646641380554970304 |
| 16 | 35173161711207720944899921 |
| 17 | 8132124409499796317194563900 |
[1,1,3,22,305,6756,216552,9416240,530764089, 37498693555,3235722405487,334075729235172, 40587204883652869,5722676826879812177, 925590727478445526747,170032646641380554970304, 35173161711207720944899921, 8132124409499796317194563900] |